Do You Understand The Method And Process Of PP Plastic Bottle

In winter, as the outdoor temperature drops sharply, some outdoor beverage stalls have an electric rice cooker. Vendors put all kinds of bottled drinks into it to heat up and sell, which is very popular with customers.

Consecutive days, the reporter visited some drinks stall shijiazhuang street found that at the zhongshan road street intersection with the construction and the place such as street, north China are selling beverage heating phenomenon, to keep the pot drinks warm, will heat the water in the rice cooker, vendor does not immediately without electricity, but always live in the insulation state. One stall owner said heated and room temperature are the same price, but customers generally prefer to choose heated.

"I buy heated drinks because I have a weak stomach. They can warm my stomach and hands." 'The vendors are very thoughtful,' said Ms. Yang, who just picked out a bottle of heated milk tea. 'It's so cold, and they're willing to buy something warm while walking outside.'

In this regard, the experts said, the market common mineral water, milk tea, carbonated drinks and other plastic bottles at the bottom of the triangle number "1", on behalf of PET, marked with "1" plastic bottle tolerance high temperature in 65 degrees Celsius or so, it is safe to use at low temperature, not suitable for repeated heating, if heated and even boil, When PET is heated, it releases a toxic substance called DEHP, which endangers human health.

PP plastic bottle method and process

PP plastic bottle stretch blow molding extrusion stretch blow molding and injection stretch blow molding two kinds, they respectively use extrusion and injection to shape the blank. After forming, the billet is cooled to high elastic state or cooled to room temperature, and then heated to high elastic state, and temperature adjustment, to obtain the best orientation temperature; Then, the billet is stretched axially with a stretching rod, and later or at the same time, the billet is blown radially with compressed air; Finally, cool the bottle quickly.

PP plastic bottles can be molded by two step extrusion stretch blow molding, one step injection stretch blow molding and two step injection stretch blow molding packaging bottles. Two - step extrusion stretch blow molding using extruded pipe as a blank, so it is also called cold tube stretch blow molding. After cooling, the extruded pipe is cut into a predetermined length and stored. During stretching blow molding, the tube blank is clamped and heated in the oven; Then the neck thread is formed, and the end of the closed tube is formed as the bottom; After that, the tube blank together with the core rod is transferred to the stretch/blow molding mold. At this time, the core rod acts as a stretch rod and is injected with compressed air to blow the tube blank radially. Finally, the tube blank is cooled and shaped into a bottle.

Biaxial orientation PP plastic bottles are more by injection stretch blow molding. At the injection station, the injection machine equipped with typical PP screw is used to melt and homogenize PP. Through the balanced hot runner system into the billet mold, forming into a tubular billet with a bottom, and cooling. After that, the billet rotates 90° with the turntable to the temperature control station to regulate the temperature distribution of the billet. After that, the billet is transferred to 90° to stretch/blow molding station, stretched and blown into bottles, and cooled. The bottle is rotated 90° to take out station.